Which statement best describes results of an experiment designed to test whether the protein cystic fibrosis transmembrane conductance regulator (CFTR) is a chloride channel?

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Electric current flowed only in the presence of CFTR, but researchers could not distinguish which ions were present.

  

Electric current flowed only in the presence of CFTR, indicating the movement of chloride ions.

  

The presence of CFTR caused chloride ions to increase both inside and outside of the cell membranes.

  

The presence of CFTR altered the solubility of chlorine ions in the plasma membrane.

 

asked Dec 25, 2012 in Biology by anonymous
    

1 Answer

0 votes

 

Electric current flowed only in the presence of CFTR, indicating the movement of chloride ions.

 

answered Dec 25, 2012 by anonymous

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